Cannot find symbol using wine

[Jonathan M Davis]

I'm trying to read from the registry (thus far unsuccesfully). 
core.sys.windows.windows has RegOpenKeyExA() in it, and I'm trying to use it to 
read a registry key. However, when I use it, I get this error upon compilation:

Error 42: Symbol Undefined _RegOpenKeyExA at 20

I'm using wine, and according to 
http://source.winehq.org/WineAPI/RegOpenKeyExA.html it appears to be 
implemented. So, what on earth could I be missing? Any help would be much 
appreciated.

- Jonathan M Davis